v2rayN/v2rayN/v2rayN/Converters/InverseBooleanConverter.cs

using System.Globalization;
using System.Windows.Data;

namespace v2rayN.Converters
{
    [ValueConversion(typeof(bool), typeof(bool))]
    public class InverseBooleanConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if(targetType != typeof(bool))
            {
                throw new InvalidOperationException("The target must be a boolean");
            }

            return !(bool)value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}